We ALWAYS wear an inflatable PFD's while underway. And we have four extras for when guests come on board. Personally I love the SpinLock deckvests, so comfy! But SpinLocks are not USCG approved so we have extra std PFD's in case of boarding by USCG. Guests are relegated to wear Revere PFD's, but they are comfortable also. We often have the grandkids aboard so it helps cut down their complaining on wearing PFD's if everyone wears one.